8x-12=21-3x

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Solution for 8x-12=21-3x equation: 



8x-12=21-3x

We move all terms to the left:

8x-12-(21-3x)=0

We add all the numbers together, and all the variables

8x-(-3x+21)-12=0

We get rid of parentheses

8x+3x-21-12=0

We add all the numbers together, and all the variables

11x-33=0

We move all terms containing x to the left, all other terms to the right

11x=33

x=33/11

x=3

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